Machine for sharpening cutter-teeth.



No. 896,357. PATENTED AUG. 18, 1908.

- R. s. BROWN. MACHINE FOB, SHARBENING CUTTER TEETH.

APPLICATION TILED JULY 1, 1907.

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N0. 896,357. PATENTED AUG. 18, 1908.

R. S; BROWN.

MACHINE FOR SHARPENING CUTTER TEETH.

APPLICATION FILED JULY 1, 1907.

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UNITED STATES PATENT OFFICE.

ROBERT S. BROWN, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR'TO THE NEWBRITAINv MACHINE COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OFCONNECTI- CUT.

MACHINE FOR SHARPENING CUTTER-TEETBL.

Specification of-Letters Patent.

Patented Aug. is, 1908.

Application filed July 1, 1907. Serial No. 381,646.

wheel on the teeth of a chain-cutter for mortising-machines, is neitherlimited to any specific use, nor to any particular character of rotarysharpening device.

Primarily the object of the invention is the provision of an improvedmachine for sharpening cutter-teeth, and one in which the root or gulletof each tooth may be formed to the desired depth and angle while thecuttingsurface of the tooth is undergoing operation.

Other objects of the invention relate to the details of the machinebywhich improved results may be obtained, as will hereinafter appear.

In the accompanying drawings, Figure 1 is a front elevation of myimproved machine; Fig. 2 is a side elevation of said machine; Fig. 3 isa section on line 33 of Figv 2; Fig. 4 is a'section on line 44 of Fig.and Fig. 5 is a section on line 55 of Fig. 1.

Like numerals .designate similar parts throughout the several views.

Referring to the drawings, the numeral 5' designates the frame of themachine, said frame being in the shape of a base 6 having risingtherefrom a curved standard 8 overhanging the base at its upper end,where it is provided with a tubular boss or bearing 9. A guard or hood10 projects from the inner end of the top of the machine where a tubularboss or bearing 9 is provided. In the bearing is journaled a shaft 12having a belt-pulley 13 at one end, and carrying at its other extremitya sharpening-tool 14 the latter being secured to the shaft by the washer15 and a nut 16. The to is flattened at 1'7, and the hood has a lateraly projecting arm 18, which is secured to the flattened top by screws19, and said hood and arm are preferably formed integral, although 'thisis immaterial. Projecting from the hood and arm is a tubular boss inwhich is secured against longitudinal displacement a screw 21 having anenlarged head 22 provided with a finger-grasp or hand-wheel 23. Rigidwith one side of the frame is a guideway 24, and in this guideway issnugly fitted a slide 25, slotted at 25 for the reception of a squaredportion 26 of a bolt or rod 26, provided with a head 27, overlapping theWalls of the slot, said bolt or rod passing through a bearing 28 in theframe of the machine, and being threaded at 29 at its end opposite thehead to receive a lever-nut 30.

In a chamber 31 of the bearing is fitted a coiled spring 32, pressing atone end against the inner wall of the chamber, and at its opposite endagainst a washer 33 surrounding the rod between the lever-nut and theframe of the machine, as illustrated in Fig. 3. This slotted slide issnugly fitted in the guideway 24, and into the upper end of said slideis threaded a screw 21 whereby the slide may be adjusted as desired andthus clamped rigidly in position by the bolt or rod 26. When thelever-nut 30 is loosened the spring 32 expands and tends to force orhold the head 27 of the bolt 26 against the Walls of the slot in theslide 25, thus holding the slide against movement except whenmanipulated by means of the screw 21 operated by the finger-grasp 23. I

- Projecting from the slide is a tubular boss or bearing 34, in which isjournaled a short shaft 35 and upon the reduced end 34 of the bearing isplaced a collar 36, flattened at 36" to receive a shoulder 37 on a bolt38, said bolt carrying at its outer end a hand or finger-grasp 39, andbeing threaded at its inner end at 40 to engage with internal threads 41of the shaft 35, and the bearing 34 being slotted at 34 to permit of alimited rockingmovement of the shaft within said bearing for a purposehereinafter set forth.

A crank-arm 42 projects from the shaft 35, and at its lower end isprovided with a laterally-projecting cylindrical rod' 43 having alongitudinal groove 44; and upon this rod is slidably mounted foradjustment in or out, in a line at right angles to the front of themachine, a sleeve 45 having a curved-surface 46 knurled at 46 to afforda convenient hand-grasp. Into and about intermediate the length of thesleeve is threaded a screw 47, having a reduced tip 48 adapted to entera groove 44 in the rod 43, and thus to prevent tion to the grinding-diskor other tool carried. by the shaft 12, and in the present instance thiswill be readily accomplished by loosening the screw 40 by means of itsmanipulating device 39, and then swinging by hand the shaft 35 in itsbearing 34, 34 until the desired angular relation of the tooth of thecut ter-chain is obtained. During this swinging tion of the bearing.After the desired admovement the head or collar 36 of course moves withthe shaft 35, and after the required adjustment has been made the screwis tightened to lock the parts in position to which they have beenadjusted. In this way the root or gullet of thetooth may be ground atany desired angle by the edge of the sharpening cutter-wheel, while thecutting-points or surfaces of said tooth are simultaneously ground bythe side of the wheel, thus enabling the achievement of a double result.

Chain-cutters are composed of links, some of which have double teeth,while others have but one tooth, and it will readily be seen that in theconstruction described either double or single teeth may be sharpenedwith ease and facility. Bolts 52 are threaded into;

the top of the overhang on the frame, and these bolts are adjustable insaid openings. J am-nuts 53 lock the bolts in proper position upon thetop of the frame, and each bolt is provided with a head 54 in which/theusual oil-cups 55 are placed.

In the operation of my invention when a tooth of a chain-cutter is to beground, the cutter-chain is fitted upon the circular rib or flange 50 ofthe sleeve 45, and said sleeve is then slid longitudinally inward alongthe rod 43 until the tooth (either double or single) to be sharpened isin proper position with relation to the sharpening-cutter. To enable theproper position to be accurately determined, so that each tooth may beground with accuracy and precision, the slide 25 is adjusted in theguideway'24 by means of the screw 21, and when it is desired to changethe angular location of the tooth with relation to the sharpening-cutterthis may be readily accomplished by loosening the screw 40 by means ofits manipulating head 39 and then swinging the shaft 35 in its bearing34, 34 after which the shaft is set in its pro er position by tighteningthe screw 40 an causing the head 37 thereof to bear against theflattened ortion 36 of the collar 36, said collar being oosely mountedon the reduced porjustments have been made the shaft 12 is set in motionand the tooth then in position is sharpened and the sleeve is thenwithdrawn, the cutter-chain is moved around the circular rib 50 to bringanother tooth into position, and the sleeve is then returned, and so onuntil the sharpening-operation of all of the teeth is completed. Byproviding the spring 32 the'head 27 of bolt 26 is held against the slideunder yielding pressure when the levernut 30 is released, and therebyall danger of dropping of the slide 25 (due to.lost-m0tion) (or othercauses) is prevented, and said slide is held snugly in its way.

Changes may be made in the various details of the mechanism withoutdeparture from the invention, and various devices may be substitutedforthose shown and described for accomplishing the feed-movement of theslide and the angular adjustment of the cutter-carrying device mountedon said slide.

From the foregoing description it will be apparent that mymachinecomprises a worksupport and a tool-support, and one of these:

supports is mounted to swing with respect to the other to vary the angleof presentation of the work to the tool, of whatever character theseparts be. In addition to this there is a work-carrier which directlysustains the work and which is bodily-adjustable on the work-support tothereby carry the work into and out of the range of action of the tool.

Having thus described the invention, what I claim is:

1. The combination of a tool-support and a work-support one of which ismounted to swing with respect to the other to vary the angle ofpresentation of the work to the tool,

one of said supports having a projection, and a sleeve slidablelongitudinally of said projection, constituting a work-carrier andadapted to suspend a chain.

2. The combination of a tool-support, a swinging worksupport, and asleeve, the work support having means for supporting said sleeve forsliding movement, the sleeve being adapted to suspend a chain and saidsliding movement permitting the chain to be brought under the action ofthe tool or withdrawn therefrom.

3. The combination, with a frame having a guideway, of a slotted slideadjustable in said guideway; a bolt or rod having a head at one end; aspring for causing the head normally to bear against the slide; andmeans for actuating the bolt to compress the spring, and clamp the headagainst the slide.

4. The combination of a tool-support, a work-support mounted forswinging movement with respect to the tool-support to vary the angle ofpresentation of the work to the tool, said work-support having aprojection, and a work-carrier slidable on said projection and adaptedto suspend a chain.

5. The combination with a frame, a slide,

supported by said frame, a bolt extending through the slide and frameand having a head and a nut one of which acts against said slide, aspring for imparting an end thrust to said bolt, and a tool-support anda work-support one of which is sustained by said slide.

6. The combination of a frame, a slide supported by said frame, a boltsupported by the frame, the slide having an elongated slot through whichthe bolt passes, said bolt having a head and a nut one of which actsagainst the slide, a spring for imparting an end thrust to said bolt tocause the part thereon which acts against the slide to have a clampingrelation thereagainst, an adjusting screw tapped into said slide, and awork support and a tool-support one of which is carried by said slidefor swinging movement.

7. The combination, with a frame having a guideway, of a slide movablein said guideway, and provided with a bearing having a slottedreduced-portion, of a shaft mounted in said guideway, andinternally-threaded at one end, said shaft having a projection, of acollar loosely mounted upon said bearing; a screw passing looselythrough said collar, and entering the internal thread of the shaft;

bearing to support said shaft, a collar loose on said bearing, aclamping-device to engage against the collar and movably connected withsaid shaft, and said bearing being slotted for the passage and lateraladjustment of said clamping-device, and a tool support and awork-support one of which is connected with said shaft.

9. The combination of a rock shaft, a bear ing for said shaft having anelongated slot, a clamping member connected with the shaft and extendingthrough said slot, for clamping the shaft and bearing together, and awork-support and a tool support one of said supports being connectedwith said rockshaft.

In testimony whereof I affix my signature in presence of two witnesses.

ROBERT S. BROWN.

